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	<div id="pagetitle"><h1>YUI Library Examples: JSON: JSON with Y.io</h1></div>
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	<h2>JSON: JSON with Y.io</h2>

	<div id="example" class="promo">
	<div class="example-intro">
	<p>A natural fit for JSON is working with the <a href="http://developer.yahoo.com/yui/io/">io module</a>.  In this example, we'll request JSON data from the server using the <code>Y.io</code> method and parse the resulting JSON string data for processing.</p>
<p>Click the Get Messages button to send the request to the server.</p>
	</div>	

	<div class="module example-container ">
			<div class="hd exampleHd">
			<p class="newWindowButton yui-skin-sam">
                <a href="json_connect_clean.html" target="_blank">View example in new window.</a>
            </p>
		</div>		<div id="example-canvas" class="bd">

		
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
	
	<div id="demo">
    <input type="button" id="demo_btn" value="Get Messages">

    <div id="demo_msg"></div>
</div>
<script type="text/javascript">
YUI().use("node", "io", "dump", "json-parse",function (Y) {

    var target = Y.Node.get('#demo_msg');

    var callback = {

        timeout : 3000,

        on : {
            success : function (x,o) {
                Y.log("RAW JSON DATA: " + o.responseText);

                // Process the JSON data returned from the server
                var messages = [],
                    html = '', i, l;

                try {
                    messages = Y.JSON.parse(o.responseText);
                }
                catch (e) {
                    alert("JSON Parse failed!");
                    return;
                }

                Y.log("PARSED DATA: " + Y.Lang.dump(messages));

                // The returned data was parsed into an array of objects.
                // Add a P element for each received message
                for (i=0, l=messages.length; i < l; ++i) {
                    html += '<p>' + messages[i].animal + ' says &quot;' +
                                    messages[i].message + '&quot;</p>';
                }

                // Use the Node API to apply the new innerHTML to the target
                target.set('innerHTML',html);
            },

            failure : function (x,o) {
                alert("Async call failed!");
            }

        }
    }

    // Attach a click event listener to the button #demo_btn to send the request
    Y.on('click',function (e) {
        // Make the call to the server for JSON data
        transaction = Y.io("assets/jsonConnect.php", callback);
    },'#demo_btn');

});
</script>
	
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
	
		
		</div>
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	</div>
		
	<h3 class="first">Use <code>Y.JSON.parse</code> in the success handler</h3>
<p>Pass the XHR <code>responseText</code> to <code>Y.JSON.parse</code> and capture the return value.  Note that the parse method can throw a <code>SyntaxError</code> exception, so be sure to wrap the call in a <code>try/catch</code> block.</p>

<div id="syntax-9c1d6547f219975f69ea718b8372e091" class="yui-syntax-highlight yui-syntax-highlight-linenumbers"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="co1">// Create business logic in a YUI sandbox using the 'io' and 'json' modules</span></div></li><li class="li1"><div class="de1">YUI<span class="br0">&#40;</span><span class="br0">&#41;</span>.<span class="kw2">use</span><span class="br0">&#40;</span><span class="st0">&quot;node&quot;</span><span class="sy0">,</span> <span class="st0">&quot;io&quot;</span><span class="sy0">,</span> <span class="st0">&quot;dump&quot;</span><span class="sy0">,</span> <span class="st0">&quot;json-parse&quot;</span><span class="sy0">,</span><span class="kw2">function</span> <span class="br0">&#40;</span>Y<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">    <span class="co1">// capture the node that we'll display the messages in</span></div></li><li class="li2"><div class="de2">    <span class="kw2">var</span> target <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'#demo_msg'</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">    <span class="co1">// Create the io callback/configuration</span></div></li><li class="li1"><div class="de1">    <span class="kw2">var</span> callback <span class="sy0">=</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li2"><div class="de2">        timeout <span class="sy0">:</span> <span class="nu0">3000</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">        on <span class="sy0">:</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">            success <span class="sy0">:</span> <span class="kw2">function</span> <span class="br0">&#40;</span>x<span class="sy0">,</span>o<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">                Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;RAW JSON DATA: &quot;</span> <span class="sy0">+</span> o.<span class="me1">responseText</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2">&nbsp;</div></li><li class="li1"><div class="de1">                <span class="kw2">var</span> messages <span class="sy0">=</span> <span class="br0">&#91;</span><span class="br0">&#93;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">                    html <span class="sy0">=</span> <span class="st0">''</span><span class="sy0">,</span> i<span class="sy0">,</span> l<span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">                <span class="co1">// Process the JSON data returned from the server</span></div></li><li class="li2"><div class="de2">                <span class="kw1">try</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">                    messages <span class="sy0">=</span> Y.<span class="me1">JSON</span>.<span class="me1">parse</span><span class="br0">&#40;</span>o.<span class="me1">responseText</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">                <span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">                <span class="kw1">catch</span> <span class="br0">&#40;</span>e<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">                    <span class="kw3">alert</span><span class="br0">&#40;</span><span class="st0">&quot;JSON Parse failed!&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2">                    <span class="kw1">return</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">                <span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">                Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;PARSED DATA: &quot;</span> <span class="sy0">+</span> Y.<span class="me1">Lang</span>.<span class="me1">dump</span><span class="br0">&#40;</span>messages<span class="br0">&#41;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li2"><div class="de2">                <span class="co1">// The returned data was parsed into an array of objects.</span></div></li><li class="li1"><div class="de1">                <span class="co1">// Add a P element for each received message</span></div></li><li class="li1"><div class="de1">                <span class="kw1">for</span> <span class="br0">&#40;</span>i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">,</span> l<span class="sy0">=</span>messages.<span class="me1">length</span><span class="sy0">;</span> i <span class="sy0">&lt;</span> l<span class="sy0">;</span> <span class="sy0">++</span>i<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">                    html <span class="sy0">+=</span> <span class="st0">'&lt;p&gt;'</span> <span class="sy0">+</span> messages<span class="br0">&#91;</span>i<span class="br0">&#93;</span>.<span class="me1">animal</span> <span class="sy0">+</span> <span class="st0">' says &amp;quot;'</span> <span class="sy0">+</span></div></li><li class="li1"><div class="de1">                                    messages<span class="br0">&#91;</span>i<span class="br0">&#93;</span>.<span class="me1">message</span> <span class="sy0">+</span> <span class="st0">'&amp;quot;&lt;/p&gt;'</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2">                <span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">                <span class="co1">// Use the Node API to apply the new innerHTML to the target</span></div></li><li class="li1"><div class="de1">                target.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">'innerHTML'</span><span class="sy0">,</span>html<span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">            <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2">&nbsp;</div></li><li class="li1"><div class="de1">            failure <span class="sy0">:</span> <span class="kw2">function</span> <span class="br0">&#40;</span>x<span class="sy0">,</span>o<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">                <span class="kw3">alert</span><span class="br0">&#40;</span><span class="st0">&quot;Async call failed!&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">            <span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li2"><div class="de2">        <span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">    <span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">    <span class="co1">// Attach a click event listener to the button #demo_btn to send the request</span></div></li><li class="li1"><div class="de1">    Y.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">'click'</span><span class="sy0">,</span><span class="kw2">function</span> <span class="br0">&#40;</span>e<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li2"><div class="de2">        <span class="co1">// Make the call to the server for JSON data</span></div></li><li class="li1"><div class="de1">        transaction <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">&#40;</span><span class="st0">&quot;assets/jsonConnect.php&quot;</span><span class="sy0">,</span> callback<span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">    <span class="br0">&#125;</span><span class="sy0">,</span><span class="st0">'#demo_btn'</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1"><span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="co1">// Create business logic in a YUI sandbox using the 'io' and 'json' modules</span>
YUI<span class="br0">&#40;</span><span class="br0">&#41;</span>.<span class="kw2">use</span><span class="br0">&#40;</span><span class="st0">&quot;node&quot;</span><span class="sy0">,</span> <span class="st0">&quot;io&quot;</span><span class="sy0">,</span> <span class="st0">&quot;dump&quot;</span><span class="sy0">,</span> <span class="st0">&quot;json-parse&quot;</span><span class="sy0">,</span><span class="kw2">function</span> <span class="br0">&#40;</span>Y<span class="br0">&#41;</span> <span class="br0">&#123;</span>
&nbsp;
    <span class="co1">// capture the node that we'll display the messages in</span>
    <span class="kw2">var</span> target <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">&#40;</span><span class="st0">'#demo_msg'</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
    <span class="co1">// Create the io callback/configuration</span>
    <span class="kw2">var</span> callback <span class="sy0">=</span> <span class="br0">&#123;</span>
&nbsp;
        timeout <span class="sy0">:</span> <span class="nu0">3000</span><span class="sy0">,</span>
&nbsp;
        on <span class="sy0">:</span> <span class="br0">&#123;</span>
            success <span class="sy0">:</span> <span class="kw2">function</span> <span class="br0">&#40;</span>x<span class="sy0">,</span>o<span class="br0">&#41;</span> <span class="br0">&#123;</span>
                Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;RAW JSON DATA: &quot;</span> <span class="sy0">+</span> o.<span class="me1">responseText</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
                <span class="kw2">var</span> messages <span class="sy0">=</span> <span class="br0">&#91;</span><span class="br0">&#93;</span><span class="sy0">,</span>
                    html <span class="sy0">=</span> <span class="st0">''</span><span class="sy0">,</span> i<span class="sy0">,</span> l<span class="sy0">;</span>
&nbsp;
                <span class="co1">// Process the JSON data returned from the server</span>
                <span class="kw1">try</span> <span class="br0">&#123;</span>
                    messages <span class="sy0">=</span> Y.<span class="me1">JSON</span>.<span class="me1">parse</span><span class="br0">&#40;</span>o.<span class="me1">responseText</span><span class="br0">&#41;</span><span class="sy0">;</span>
                <span class="br0">&#125;</span>
                <span class="kw1">catch</span> <span class="br0">&#40;</span>e<span class="br0">&#41;</span> <span class="br0">&#123;</span>
                    <span class="kw3">alert</span><span class="br0">&#40;</span><span class="st0">&quot;JSON Parse failed!&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
                    <span class="kw1">return</span><span class="sy0">;</span>
                <span class="br0">&#125;</span>
&nbsp;
                Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;PARSED DATA: &quot;</span> <span class="sy0">+</span> Y.<span class="me1">Lang</span>.<span class="me1">dump</span><span class="br0">&#40;</span>messages<span class="br0">&#41;</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
                <span class="co1">// The returned data was parsed into an array of objects.</span>
                <span class="co1">// Add a P element for each received message</span>
                <span class="kw1">for</span> <span class="br0">&#40;</span>i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">,</span> l<span class="sy0">=</span>messages.<span class="me1">length</span><span class="sy0">;</span> i <span class="sy0">&lt;</span> l<span class="sy0">;</span> <span class="sy0">++</span>i<span class="br0">&#41;</span> <span class="br0">&#123;</span>
                    html <span class="sy0">+=</span> <span class="st0">'&lt;p&gt;'</span> <span class="sy0">+</span> messages<span class="br0">&#91;</span>i<span class="br0">&#93;</span>.<span class="me1">animal</span> <span class="sy0">+</span> <span class="st0">' says &amp;quot;'</span> <span class="sy0">+</span>
                                    messages<span class="br0">&#91;</span>i<span class="br0">&#93;</span>.<span class="me1">message</span> <span class="sy0">+</span> <span class="st0">'&amp;quot;&lt;/p&gt;'</span><span class="sy0">;</span>
                <span class="br0">&#125;</span>
&nbsp;
                <span class="co1">// Use the Node API to apply the new innerHTML to the target</span>
                target.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">'innerHTML'</span><span class="sy0">,</span>html<span class="br0">&#41;</span><span class="sy0">;</span>
            <span class="br0">&#125;</span><span class="sy0">,</span>
&nbsp;
            failure <span class="sy0">:</span> <span class="kw2">function</span> <span class="br0">&#40;</span>x<span class="sy0">,</span>o<span class="br0">&#41;</span> <span class="br0">&#123;</span>
                <span class="kw3">alert</span><span class="br0">&#40;</span><span class="st0">&quot;Async call failed!&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
            <span class="br0">&#125;</span>
&nbsp;
        <span class="br0">&#125;</span>
    <span class="br0">&#125;</span>
&nbsp;
    <span class="co1">// Attach a click event listener to the button #demo_btn to send the request</span>
    Y.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">'click'</span><span class="sy0">,</span><span class="kw2">function</span> <span class="br0">&#40;</span>e<span class="br0">&#41;</span> <span class="br0">&#123;</span>
        <span class="co1">// Make the call to the server for JSON data</span>
        transaction <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">&#40;</span><span class="st0">&quot;assets/jsonConnect.php&quot;</span><span class="sy0">,</span> callback<span class="br0">&#41;</span><span class="sy0">;</span>
    <span class="br0">&#125;</span><span class="sy0">,</span><span class="st0">'#demo_btn'</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
<span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></pre></div><textarea id="syntax-9c1d6547f219975f69ea718b8372e091-plain">// Create business logic in a YUI sandbox using the 'io' and 'json' modules
YUI().use("node", "io", "dump", "json-parse",function (Y) {

    // capture the node that we'll display the messages in
    var target = Y.Node.get('#demo_msg');

    // Create the io callback/configuration
    var callback = {

        timeout : 3000,

        on : {
            success : function (x,o) {
                Y.log("RAW JSON DATA: " + o.responseText);

                var messages = [],
                    html = '', i, l;

                // Process the JSON data returned from the server
                try {
                    messages = Y.JSON.parse(o.responseText);
                }
                catch (e) {
                    alert("JSON Parse failed!");
                    return;
                }

                Y.log("PARSED DATA: " + Y.Lang.dump(messages));

                // The returned data was parsed into an array of objects.
                // Add a P element for each received message
                for (i=0, l=messages.length; i < l; ++i) {
                    html += '<p>' + messages[i].animal + ' says &quot;' +
                                    messages[i].message + '&quot;</p>';
                }

                // Use the Node API to apply the new innerHTML to the target
                target.set('innerHTML',html);
            },

            failure : function (x,o) {
                alert("Async call failed!");
            }

        }
    }

    // Attach a click event listener to the button #demo_btn to send the request
    Y.on('click',function (e) {
        // Make the call to the server for JSON data
        transaction = Y.io("assets/jsonConnect.php", callback);
    },'#demo_btn');

});</textarea></div>
<p>The <code>parse</code> method returns the native JavaScript object representation of the string data returned from the <code>Y.io</code> call.  In this case, the data is an array of object literals in this form:</p>
<div id="syntax-fd65a49af3afa384a605b93b157c66f4" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="br0">&#91;</span></div></li><li class="li1"><div class="de1">    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Cat&quot;</span><span class="sy0">,</span>  <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Meow&quot;</span>  <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Dog&quot;</span><span class="sy0">,</span>  <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Woof&quot;</span>  <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Cow&quot;</span><span class="sy0">,</span>  <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Moo&quot;</span>   <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2">    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Duck&quot;</span><span class="sy0">,</span> <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Quack&quot;</span> <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Lion&quot;</span><span class="sy0">,</span> <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Roar&quot;</span>  <span class="br0">&#125;</span></div></li><li class="li1"><div class="de1"><span class="br0">&#93;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="br0">&#91;</span>
    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Cat&quot;</span><span class="sy0">,</span>  <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Meow&quot;</span>  <span class="br0">&#125;</span><span class="sy0">,</span>
    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Dog&quot;</span><span class="sy0">,</span>  <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Woof&quot;</span>  <span class="br0">&#125;</span><span class="sy0">,</span>
    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Cow&quot;</span><span class="sy0">,</span>  <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Moo&quot;</span>   <span class="br0">&#125;</span><span class="sy0">,</span>
    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Duck&quot;</span><span class="sy0">,</span> <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Quack&quot;</span> <span class="br0">&#125;</span><span class="sy0">,</span>
    <span class="br0">&#123;</span> <span class="st0">&quot;animal&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Lion&quot;</span><span class="sy0">,</span> <span class="st0">&quot;message&quot;</span> <span class="sy0">:</span> <span class="st0">&quot;Roar&quot;</span>  <span class="br0">&#125;</span>
<span class="br0">&#93;</span></pre></div><textarea id="syntax-fd65a49af3afa384a605b93b157c66f4-plain">[
    { "animal" : "Cat",  "message" : "Meow"  },
    { "animal" : "Dog",  "message" : "Woof"  },
    { "animal" : "Cow",  "message" : "Moo"   },
    { "animal" : "Duck", "message" : "Quack" },
    { "animal" : "Lion", "message" : "Roar"  }
]</textarea></div>				</div>
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